Improvement in furnaces



W D THOMAS.

,Evaporating Pan.

Patented Sept. 4, 1860.

UNITED STATES WM. D. THOMAS, OF MORRISTOWN, VERMONT.

IMPROVEMENT IN FURNACES.

Specification forming part of Letters Patent No. 29.925, dated September4, 1860.

To aZZ whom it may concern; 4

Be it known that I, WILLIAM D. THOMAS, of Morristown, in the county ofLamoille and State of Vermont, have invented a new and improved mode ofarranging furnaccs for the evaporation of saccharine juices and othersubstances; and I do herebydeclare that the following is a full, clear,and exact description thereo'.

The nature of my invention consists in snrrounding three' sides of thefire-place, at its upper edges, With a semi-tubular flange, soconstructed that, by putting on a pan or boiler, the sides of theevaporating-pan, together with the tubular flange aforesaid, will form aflue for the passage of the hot air and gases from the fire, which arethus conducted around the sides of the evaporating-pan; and also theconstruction of dampers at the end of the said flues, so that a streamof cold air may be admitted to the flues whenever necessary, thuspreventing the burning of the substances within the pan, and also, incase of saccharne juices, preventing them from boiling over, as they areapt to do when Very :near the consistency of sugar.

To enable others to make and use of my invention, give the followingdescription of its Construction and operation, reference being had tothe drawings, in which- Figure 1 is a front elevation of furnace. F'g. 2is a section on x x, and Fig. 3 a vertical section on y y. I

I build my furnace of usual materials, and, except that it is wider atthe top than the bottom, of common form. I use for the top or cover ofmy furnace the shallow evaporatingpan or boiler now commonly used inmanufacturing mapIesugar. I build the sides of my furnace of such a sizethat the bottom of the evaporating-pan will rest upon them at its outeredges, and so 4 that without the fiues, hereinafter to be nentioned,when the pan is in its position, there is no escape for the gases andallow the passage of fiame, gases, 850.,

from the fire to the flues. I place the chimney or smoke-pipe at the endof the furnace opposite to the door or other opening for putting infuel. On the two sides and the end neXt to the chimney or smoke-pipe Iconstruct the flange above mentioned, which, commencing at the upperedges of the sides of the furnace where the boiler rests upon them,first extends horizontally, and is then curved upward and backward, sothat its outer edge is brought back into contact with the sides of thepan or boiler, so that when the boler is in position, a fine is formdand connected with the chimney or smoke-pipe. I close the ends of thisfiue nearest the door with dampers, which may be opened or shut atpleasure.

The accompanying drawings represent a furnace constructed according tomy plan without the top or evaporating-pan.

The part lettered A is the body of the furnace.

B B is the flange surmounting the sides of the frnace.

C C are the openings for the escape of the gases and smoke from the fireto the flues.

D is the aperture leading to the smoke-chimney E, and F F are thedampers, one open and the other closed.

P represents the evaporating-pan when in position for use.

What I claim, and desire to secure by Letters Patent, is-

The arrangement of the side flues and dampers relatively to the pan, asand for the purpose set forth.

\VM. D. THOMAS.

Witnesses:

R. C. BENTON, MAsoN' PEAKE.

